SLParseInContextTest.java

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package com.oracle.truffle.sl.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import org.junit.Before;
import org.junit.Test;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.TruffleLanguage.Env;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.vm.PolyglotEngine;

public class SLParseInContextTest {
    private PolyglotEngine vm;

    @Before
    public void prepareMethods() throws Exception {
        vm = PolyglotEngine.newBuilder().build();
    }

    @Test
    public void parseAPlusB() throws Exception {
        PolyglotEngine.Value value = vm.eval(Source.newBuilder("").name("eval.eval").mimeType("application/x-test-eval").build());
        Object fourtyTwo = value.get();
        assertTrue("Result is a number: " + fourtyTwo, fourtyTwo instanceof Number);
        assertEquals(42, ((Number) fourtyTwo).intValue());
    }

    @TruffleLanguage.Registration(mimeType = "application/x-test-eval", name = "EvalLang", version = "1.0")
    public static final class EvalLang extends TruffleLanguage<Env> {

        @Override
        protected Env createContext(Env env) {
            return env;
        }

        @Override
        protected Object findExportedSymbol(Env context, String globalName, boolean onlyExplicit) {
            return null;
        }

        @Override
        protected Object getLanguageGlobal(Env context) {
            return null;
        }

        @Override
        protected boolean isObjectOfLanguage(Object object) {
            return false;
        }

        @Override
        protected CallTarget parse(ParsingRequest request) throws Exception {
            return Truffle.getRuntime().createCallTarget(new RootNode(this) {
                @Override
                public Object execute(VirtualFrame frame) {
                    return parseAndEval();
                }

                @TruffleBoundary
                private Object parseAndEval() {
                    Source aPlusB = Source.newBuilder("a + b").mimeType("application/x-sl").name("plus.sl").build();
                    return getContextReference().get().parse(aPlusB, "a", "b").call(30, 12);
                }
            });
        }
    }
}